/*
 * Copyright Camunda Services GmbH and/or licensed to Camunda Services GmbH
 * under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright
 * ownership. Camunda licenses this file to you under the Apache License,
 * Version 2.0; you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.camunda.bpm.engine.spring;

import java.net.URL;
import java.util.Map;
import java.util.logging.Logger;

import org.camunda.bpm.engine.ProcessEngineException;
import org.camunda.bpm.engine.ProcessEngine;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.GenericXmlApplicationContext;
import org.springframework.core.io.UrlResource;


/**
 * @author Tom Baeyens
 */
public class SpringConfigurationHelper {
  
  private static Logger log = Logger.getLogger(SpringConfigurationHelper.class.getName());

  public static ProcessEngine buildProcessEngine(URL resource) {
    log.fine("==== BUILDING SPRING APPLICATION CONTEXT AND PROCESS ENGINE =========================================");
    
    ApplicationContext applicationContext = new GenericXmlApplicationContext(new UrlResource(resource));
    Map<String, ProcessEngine> beansOfType = applicationContext.getBeansOfType(ProcessEngine.class);
    if ( (beansOfType==null)
         || (beansOfType.isEmpty())
       ) {
      throw new ProcessEngineException("no "+ProcessEngine.class.getName()+" defined in the application context "+resource.toString());
    }
    
    ProcessEngine processEngine = beansOfType.values().iterator().next();

    log.fine("==== SPRING PROCESS ENGINE CREATED ==================================================================");
    return processEngine;
  }


}
